On Sun, Aug 16, 2009 at 8:40 PM, Mark Rages<markrages@gmail.com> wrote:
> Wouldn't this scheme lock to subharmonics of the actual period? =A0For
> example, the wheel rotates twice a second, but the sensor might lock
> on to once per second and read a speed of half the actual speed.
>
> And 1 mA is a *lot* of current for this. =A0There is no reason low-power
> design is incompatible with hobby electronics. =A0There are no special
> tools or techniques required for designing for low power. =A0Just read
> the datasheet, use sleep mode, and measure the actual current draw
> with a DMM. =A0Nothing tricky.

Very true! And what's a DMM?

> For solarwind, you should look at the AVR butterfly kit for this. =A0For
> $20 you get a micro with bootloader and a decent LCD, and the battery
> holder and other goodies are there too. =A0 I know you write C, and
> there is a good GCC port for AVR.

Thanks for the suggestion, but I prefer to stick with PICs (for now).
I already have an LCD and all the necessary tools and supplies except
for the reed switch.

-- =

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